What idioms are there to express politeness?

Civilized and polite idioms are:

Courtesy and reciprocity; Respect the old and love the young; Qi Mei; Respect each other as guests; Ceremony three first; The benevolent loves others; Father and son are filial; Modesty and courtesy; Heart to heart; Be kind to others; Waiting for an empty seat; Politeness; Approachable. Politeness; Modesty and prudence; A humble corporal; Be respectful and courteous; Don't pity or cut; Treat each other sincerely; Be respectful and courteous; Corporal Li Xian; Approachable; Gentle and sincere; Gentle and sincere; All ears; Respect each other as guests; Treat each other with courtesy; Open-minded; Listen to yourself; Waiting to leave; Loyalty and joy; Avoid arrogance and rashness; Self-knowledge; Not arrogant and impetuous; Love and courtesy; High and low; Treat others with self-denial; Condescending to be virtuous; Sweep paths, etc.; Sweep the couch to welcome guests; Welcome people with kindness; Thai but not arrogant; Gentle and graceful; Enthusiastic, respectful and straightforward; Warm, respectful and overreaching; Gentle and sincere.